[Bug]: Inconsistent Visualization of Intervals in ax.barh for Different Duration Widths

[AndreasLR]

Bug summary

Issue Description:

When using ax.barh to visualize intervals, the function fails to display all intervals under certain conditions, which appears to be linked to the width of the intervals specified as duration. Specifically, intervals with a duration of 3 hours are not displayed properly, while increasing the duration to 5 hours results in correct visualization. This issue suggests a potential problem with how interval widths are handled or rendered in ax.barh.

Steps to Reproduce:
Refer to "code for reproduction"

Expected Behavior:

All intervals should be visualized consistently, regardless of their duration width.

Actual Behavior:

Intervals with a shorter duration (3 hours) are not visualized correctly, while longer durations (5 hours) are displayed as expected.

Code for reproduction

from datetime import datetime, timedelta
import matplotlib.pyplot as plt

fig, ax = plt.subplots()

duration = timedelta(hours=3)
# duration = timedelta(hours=5)
ax.barh(y=0, width=duration, left=datetime(2024, 1, 1, 6))
ax.barh(y=1, width=duration, left=datetime(2024, 1, 1, 1))

plt.xticks(rotation=45)
plt.tight_layout()
plt.savefig('bug.png')

Actual outcome

Only one of two bars is rendered.

Expected outcome

I expect both bars to appear:

Additional information

No response

Operating system

Ubuntu and Manjaro

Matplotlib Version

3.8.4

Matplotlib Backend

agg

Python version

3.11.8

Jupyter version

No response

Installation

pip

[tacaswell]

This is a bug with the auto-limits as first bar starts immediately on the right limit

If you draw the edges on the patches:

ax.barh(y=0, width=duration, left=datetime(2024, 1, 1, 6), lw=10, ec='k')
ax.barh(y=1, width=duration, left=datetime(2024, 1, 1, 1), lw=10, ec='k')

you can see the left edge of the blue bar peaking out

Why making the orange bar long enough to overlap "fixes" it is very surprising to me.

[tacaswell]

If you pan (or manually set the limits) the second bar renders correctly, it is just that it is off screen by default.